Well, I will continue to work on those waterfalls! My must-do additions are as follows: 1) rocks at the top of the waterfalls, 2) adding waterfalls to the mountaintop terrain as well, and 3) hidden cave behind the waterfall.
In the meantime, I've been expanding the building terrain. As it stood, it didn't offer a lot of variety in terms of straight and corner tiles. It had more options for the centre tiles. However, not everyone is going to want to make huge buildings, so some people mightn't use those centre tiles at all. I needed to give people more options for small buildings.
As it stood, there were really only two options for the straight/02 building tile: with a curved balcony, and without. In fact, these two options resulted in eight tiles, as each of the two types needed versions with/without doors (or with fewer doors), and with/without dormer windows in the roof. Still, it wasn't much variety:
Accordingly, I increased the total number of straight/02 tiles to 29, adding the following tiles (as well as variations without doors and/or dormer windows, except in the case of the tile with the round "cut-out" from the building area, which doesn't have room in the roof for dormers):
Now, this is fine in terms of variation for building shapes that include a straight/02 tile, but what about smaller buildings that don't even have room for one of those tiles? There weren't many corner/04 tiles, so I added a few more (to a total of ten). Even still, though, those tiles don't offer much room to fit interesting geometry, at least not in a way that would blend compatibly with all possible connecting tiles. Accordingly, I came up with the idea of turning the straight/02 tiles into a series of groups of two corner tiles. This gives many more options, whether one wants to treat the two corners as the front, side, or back of the small building. Here are some examples (from a total of 11 such groups):
I've also made a few diagonal/03 tiles, but they're nothing special: just there to give options in case people want them. I have yet to add much in the way of variety when it comes to L-shaped, interior corner tiles.
The tileset currently totals 326 tiles.